How do you make super clear ice?

“Just fill it with water and put it in the freezer without the lid,” English says. “The first part to freeze [at the top] will be clear and the bottom of the block will be cloudy.” The process can take several days, but English says the clear ice can also be pulled out before the whole block freezes, after 1-2 days.

Why are my ice cubes cloudy?

What Causes Cloudy Ice? ... In a typical home freezer, water is surrounded by frigid air, causing ice cubes to freeze from the outside in. This forces air bubbles, and potentially impurities, toward the middle of the ice cube to freeze last, giving ice a cloudy appearance.